After reading your book, I have begun to think about a short term trading system utilizing 3x leveraged etfs. Really to generate cash income. Don't know if it would work but thinking about a constant value of 10000, rebalance +/- 5%, weekly rebalance, use sogotrade $3 trades. Thoughts? In any system, what do you do if you run out of cash to invest say on a precipitous market decline and not able to rebalance to the constant value amount? Thanks